<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>数学方程式</title>
		<style type="text/css">
		h3 {font-size:24px; color:red; text-align:center;}
		</style>
	</head>
	<body>
		<h3>数学方程式</h3>
		<hr color="blue" size="2px" width="80%" />
		<p align="center">2x<sup>2</sup>+3x=9</p>
		<p align="center">x<sub>1</sub>+x<sub>2</sub>=10</p>
	</body>
</html>
